Superabsorbent hydrogel based on sulfonated-starch for improving water and saline absorbency

The co-polymerization was conducted for 60 min polymerization time, 0.75% (wt/wt) ammonium persulfate (APS) associated with sodium bisulfite, SBS, (50% (wt/wt) of APS), 65 °C for polymerization temperature and double molar ratio of acrylonitrile to the starch derivatives. The hydrogel based on the sulfonated starch derivatives 1 and 2 showed superior water absorbency for both distilled (250% and 190% respectively) and saline (90% and 70%) solutions over that of the native starch.